Classic Doctor Who Season 20 Episode 10 Mawdryn Undead: Part 2

In this episode of Classic Doctor Who, season 20 episode 10, titled "Mawdryn Undead: Part 2," the Doctor continues his search for the deadly space virus that has infected Tegan and Nyssa. With the help of Brigadier Lethbridge-Stewart and his UNIT soldiers, the Doctor discovers that the virus was stolen by a group of renegade Time Lords led by Lord President Borusa.

However, the Doctor's plans are complicated by the return of the villainous "Black Guardian," who demands that the Doctor deliver the Key to Time in exchange for the antidote to the space virus. The Doctor refuses, and the Black Guardian unleashes his vengeful wrath upon the Doctor and his companions.

Meanwhile, Brigadier Lethbridge-Stewart becomes caught up in a dangerous plot involving Mawdryn, a Time Lord who has become trapped in a never-ending cycle of regeneration. With the help of a mysterious spacecraft and a young student named Turlough, the Brigadier races to unravel the mystery of Mawdryn's curse before it's too late.

As the Doctor and his companions struggle to find a cure for the space virus, they become embroiled in a battle for the fate of the universe itself. Will the Doctor be able to outmaneuver the Black Guardian and save his friends before it's too late? Find out in this thrilling installment of Classic Doctor Who!